Most bisexual porn is made by small production companies rather than the major studios. The term breast fetishism is also used to refer to cultural attention to female breasts and the sexuality they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual males in western societies is a sexual fetish. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. A related term used in the genre is the term cougar, which implies an older woman black gay porn as predator. Low et al. Following World War II, during a period of social repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each other. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. Pantyhose/Tights/Stockings pornography involves women or men dressed in pantyhose, tights, or stockings. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard.